*The genuine fourth edition was issued in 1901, by Appleton in New York; Osler preferred to produce a new edition every three years but through an oversight, the British copyright was not obtained for the fourth edition and a pirated and cheaper version was issued by Pentland, Edinburgh, heavily affecting legitimate sales. Osler therefore rushed out a fifth edition in 1902 solely to secure British copyright. RAYMOND HENRY PAYNE CRAWFURD, author of 'The blessing of cramp-rings : a chapter in the history of the treatment of epilepsy', AND 'Contributions from the history of medicine to the problem of the transmission of typhus'. JOHN EDGCUMBE, author of 'The haematological effects of air-encephalography', 1954.